The 392 HEMI 6.4L V8 paired with a TR6060 6-speed manual transmission is an excellent high-performance drivetrain package for a serious muscle car or restomod project. The 392 HEMI produces approximately 485 HP and 475 LB-FT of torque in its naturally aspirated factory 485-hp configuration. Peak horsepower occurs around 6,100 RPM, with peak torque around 4,200 RPM. Exact output depends on the engine version, calibration, and exhaust setup. The package includes the engine, TR6060 6-speed manual transmission, wiring harness, programmed computer, ECU, electronic accelerator pedal, and shifter assembly. Together, these components provide the foundation for a modern electronic engine installation with precise throttle control and engaging manual shifting. Fuel efficiency will depend on vehicle weight, gearing, rear-end ratio, and driving style. Expect approximately 14–20 MPG in a properly configured street vehicle, although aggressive driving will reduce mileage considerably.

This Chevrolet Performance SuperMatic 4L75-E is a robust four-speed overdrive automatic built on the compact 4L65-E/4L70-E architecture but heavily upgraded for serious power. It is rated for 650 lb-ft of torque capacity—well above the 4L60-E (≈380), 4L65-E (≈430), and 4L70-E (≈495)—while remaining smaller and lighter than a 4L80-E. Key durability features include five-pinion planetary gearsets, heat-treated stator shaft splines, an induction-hardened turbine shaft, an eight-friction-plate 3-4 clutch pack, a high-strength input housing, higher-capacity servo, and a larger 2-4 band, plus performance valve-body calibration. Gear ratios are 3.06 (1st), 1.62 (2nd), 1.00 (3rd), and 0.70 (4th overdrive), delivering strong launches and efficient highway cruising. The unit is 2WD with the included torque converter, making it installation-ready for many LS, LT, small-block, or big-block applications.

The 5.7L HEMI produces approximately 360–395 horsepower and 390–410 lb-ft of torque, depending on model year and factory configuration. Peak horsepower is generally achieved around 5,150–5,600 RPM, with peak torque around 3,950–4,400 RPM. The ZF 8HP70 is rated for up to 516 lb-ft of engine torque (700 Nm), providing eight forward gears, quick shifting and overdrive for highway cruising. The complete package includes the engine, transmission, engine wiring harness, transmission wiring, programmed ECU/PCM, accelerator gas pedal, electronic throttle controls and electronic drive shifter. Having matched electronics is essential for proper engine starting, throttle response, transmission shifting and communication between control modules. Fuel efficiency: Depending on vehicle weight, gearing and tuning, fuel economy varies. The original Ram application achieved approximately 15–18 MPG city and 21–26 MPG highway, depending on configuration.